Prove: `gamma_(sb)=(G-1)/(1+e)*gamma_w`.where,`gamma_(sb)` represents submerged unit weight.

By definition,we have,

`gamma_(sb )=gamma_(sat)-gamma_w`

Also,we know,

`gamma_(sat)=(G+e )/(1+e)*gamma_w`

Thus,`gamma_(sb)=((G+e)/(1+e)*gamma_w)-gamma_w`

`=(G+e-1-e)/(1+e)*gamma_w`

Thus, `gamma_(sb )=(G-1)/(1+e)*gamma_w`

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